A crystal tuning fork, designed for sharp resonant oscillations when operated in vacuum at room temperature, is immersed in liquid helium instead. The tuning fork behavior is affected by the surrounding fluid and varies as the helium temperature is lowered through the superfluid transition. A “suck stick” cryostat is used to get liquid helium to temperatures ranging from 1.6 to 4.2 K. The tuning fork’s frequency and transient responses are measured in that environment and compared with predictions based on simple models for the tuning fork and liquid helium